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Privacy Policy

Last updated: September 4, 2026

Introduction

Sudoku69 is a free browser-based Sudoku game. No account creation or login is required to play. Signing in with Google is optional. This policy explains what data we collect and how we use it.

Data We Collect

We do not collect personal information unless you choose to sign in. We do not ask for payment information, and there are no registration forms on this site. Playing anonymously stores nothing about you on our servers.

Accounts (optional Google sign-in)

You can sign in with your Google account. Sign-in is handled by Supabase Auth together with Google Identity. When you sign in we receive from Google:

  • your Google account ID
  • your email address
  • your display name
  • your profile picture URL

This information is stored by Supabase in the authentication database of our project. We use it only to show that you are signed in and, in the future, to keep your progress across devices. We never see or store your Google password.

Your session token is kept in your browser's localStorage under the key sudoku-auth. Signing out removes it.

To delete your account and the data above, email privacy@sudoku69.com from the address you signed in with. We delete the account manually within 30 days. Self-service deletion will be added later.

Google Analytics

We use Google Analytics (GA4) to understand how visitors use our site. Google Analytics collects anonymous data such as page views, session duration, device type, browser, and approximate geographic location.

Google Analytics uses cookies to gather this information. The data is processed by Google in accordance with their privacy policy. Our tracking ID is G-8JDMVHP06N.

Local Storage

Your browser stores game data locally using localStorage. This data stays on your device and is never sent to our servers:

  • sudoku-settings — your theme preference (light, dark, or sepia)
  • sudoku-board-store — your current game state and progress
  • sudoku-auth — your sign-in session, only if you signed in

We cannot access, read, or modify this data. It exists only in your browser.

Third-Party Services

We use three third-party services: Google Analytics (usage statistics), Supabase (puzzle database and authentication), and Google Identity (optional sign-in). We do not use advertising networks, tracking pixels, social media widgets, or any other third-party tools.

Your Rights

You have full control over the data stored on your device and, if you signed in, over your account:

  • Clear localStorage through your browser settings to delete all local game data
  • Sign out to remove your session from the browser
  • Email us to delete your account and the profile data received from Google
  • Use browser extensions like Google Analytics Opt-out Add-on to disable analytics tracking
  • Use your browser's privacy or incognito mode to prevent any data storage

Contact

Questions about this privacy policy? Email us at privacy@sudoku69.com.